TLR7 Signaling Shapes and Maintains Antibody Diversity Upon Virus-Like Particle Immunization.

Chang, Xinyue; Krenger, Pascal; Krüger, Caroline C; Zha, Lisha; Han, Jiami; Yermanos, Alexander; Roongta, Salony; Mohsen, Mona O; Oxenius, Annette; Vogel, Monique; Bachmann, Martin F (2022). TLR7 Signaling Shapes and Maintains Antibody Diversity Upon Virus-Like Particle Immunization. Frontiers in immunology, 12, p. 827256. Frontiers Research Foundation 10.3389/fimmu.2021.827256

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Virus-like particles (VLPs) are used in different marketed vaccines and are able to induce potent antibody responses. The innate pattern recognition receptors TLR7/8 recognize single stranded (ss) RNA naturally packaged into some VLPs and have been shown to enhance the production of IgG antibodies upon immunization. Here we demonstrate that, upon immunization with RNA-loaded bacteriophage-derived VLP Qβ, TLR7 signaling accelerates germinal center formation, promotes affinity/avidity maturation of VLP-specific IgG and isotype switching to IgG2b/2c. These findings extrapolated to antigens displayed on Qβ; as Fel d 1, the major cat allergen, chemically attached to Qβ also induced higher affinity/avidity IgG2b/2c antibodies in a TLR7-dependent fashion. Chimeric mice lacking TLR7-expression exclusively in B cells demonstrated that the enhanced IgG responses were driven by a B cell intrinsic mechanism. Importantly, deep sequencing of the BCR repertoire of antigen-specific B cells demonstrated higher diversity in mice with TLR7 signaling in B cells, suggesting that TLR7-signaling drives BCR repertoire development and diversity. Furthermore, the current data demonstrate that high levels of clonal diversity are reached early in the response and maintained by TLR7 signaling. In conclusion, TLR7 signaling enhances levels and quality of IgG antibodies, and this finding has major implications for vaccine design.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DBMR Forschung Mu35 > Forschungsgruppe Rheumatologie
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DBMR Forschung Mu35 > Forschungsgruppe Rheumatologie

04 Faculty of Medicine > Department of Dermatology, Urology, Rheumatology, Nephrology, Osteoporosis (DURN) > Clinic of Rheumatology and Immunology
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR)
04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Institute for Immunology [discontinued]

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Chang, Xinyue, Krenger, Pascal Siegfried, Krüger, Caroline Claire, Roongta, Salony, Mohsen, Mona Omar Mahmoud, Vogel, Monique, Bachmann, Martin (B)

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1664-3224

Publisher:

Frontiers Research Foundation

Language:

English

Submitter:

Lee-Anne Brand

Date Deposited:

21 Dec 2022 11:27

Last Modified:

29 Mar 2023 23:38

Publisher DOI:

10.3389/fimmu.2021.827256

PubMed ID:

35126381

Uncontrolled Keywords:

B cell receptor repertoire Fel d 1 Qβ-VLP TLR7 hypermutation

BORIS DOI:

10.48350/176197

URI:

https://boris.unibe.ch/id/eprint/176197

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